When you ask "What number is halfway between 100 and 851?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=851.
To find the number halfway between 100 and 851, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 851 into our formula, we get:
(100 + 851)/2 = 475.5
Thus, the number halfway between 100 and 851 is 475.5.
To check that our answer is correct, we subtract 100 from 475.5 and subtract 475.5 from 851 and compare the two numbers:
475.5 - 100 = 375.5
851 - 475.5 = 375.5
As you can see, the halfway number is 375.5 higher than 100 and 375.5 lower than 851. Therefore, our halfway between answer of 475.5 above is correct.
Halfway Between
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Halfway Between 100 and 852
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